Unable to send SMS messages

SMS message sending may fail due to the following reasons:

• Check whether you are using a China Telecom SIM card. China Telecom SIM cards do not support sending SMS messages over a 4G network, and can only send messages in CDMA mode, which is not supported by the HUAWEI Mobile WiFi series.
• The signal at your current location is poor. Move to an area with a better signal to send SMS messages.
• The SMS message recipient's number was incorrect.
• Your SIM card is out of credit and needs topping up.